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Author |
Lucia Gualtieri, Etienne Bachmann, Frederik J Simons, Jeroen Tromp |
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Title |
Generation of secondary microseism Love waves: effects of bathymetry, 3-D structure and source seasonality |
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Year |
2021 |
Publication  |
Geophysical Journal International |
Abbreviated Journal |
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Volume |
226 |
Issue |
1 |
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192-219 |
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133 |
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0956-540X |
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yes |
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8016 |
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Book |
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Year |
2021 |
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Pages |
322-393 |
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1003 |
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978-3-443-11034-5 |
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yes |
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8296 |
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Author |
Chiara Papetti, Massimiliano Babbucci, Agnes Dettai, Andrea Basso, Magnus Lucassen, Lars Harms, Celine Bonillo, Franz Maximilian Heindler, Tomaso Patarnello, Enrico Negrisolo |
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Title |
Not Frozen in the Ice: Large and Dynamic Rearrangements in the Mitochondrial Genomes of the Antarctic Fish |
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Journal |
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Year |
2021 |
Publication |
Genome Biology and Evolution |
Abbreviated Journal |
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Volume |
13 |
Issue |
3 |
Pages |
evab017 |
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Abstract |
The vertebrate mitochondrial genomes generally present a typical gene order. Exceptions are uncommon and important to study the genetic mechanisms of gene order rearrangements and their consequences on phylogenetic output and mitochondrial function. Antarctic notothenioid fish carry some peculiar rearrangements of the mitochondrial gene order. In this first systematic study of 28 species, we analyzed known and undescribed mitochondrial genome rearrangements for a total of eight different gene orders within the notothenioid fish. Our reconstructions suggest that transpositions, duplications, and inversion of multiple genes are the most likely mechanisms of rearrangement in notothenioid mitochondrial genomes. In Trematominae, we documented an extremely rare inversion of a large genomic segment of 5,300?bp that partially affected the gene compositional bias but not the phylogenetic output. The genomic region delimited by nad5 and trnF, close to the area of the Control Region, was identified as the hot spot of variation in Antarctic fish mitochondrial genomes. Analyzing the sequence of several intergenic spacers and mapping the arrangements on a newly generated phylogeny showed that the entire history of the Antarctic notothenioids is characterized by multiple, relatively rapid, events of disruption of the gene order. We hypothesized that a pre-existing genomic flexibility of the ancestor of the Antarctic notothenioids may have generated a precondition for gene order rearrangement, and the pressure of purifying selection could have worked for a rapid restoration of the mitochondrial functionality and compactness after each event of rearrangement. |
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Programme |
1124 |
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ISSN |
1759-6653 |
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yes |
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Serial |
8235 |
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Title |
Using Reciprocal Transplants to Assess Local Adaptation, Genetic Rescue, and Sexual Selection in Newly Established Populations |
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Journal |
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Year |
2021 |
Publication |
Genes |
Abbreviated Journal |
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Volume |
12 |
Issue |
1 |
Pages |
5 |
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Keywords |
gene flow genetic rescue local adaptation mating success small population |
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Abstract |
Small populations establishing on colonization fronts have to adapt to novel environments with limited genetic variation. The pace at which they can adapt, and the influence of genetic variation on their success, are key questions for understanding intraspecific diversity. To investigate these topics, we performed a reciprocal transplant experiment between two recently founded populations of brown trout in the sub-Antarctic Kerguelen Islands. Using individual tagging and genetic assignment methods, we tracked the fitness of local and foreign individuals, as well as the fitness of their offspring over two generations. In both populations, although not to the same extent, gene flow occurred between local and foreign gene pools. In both cases, however, we failed to detect obvious footprints of local adaptation (which should limit gene flow) and only weak support for genetic rescue (which should enhance gene flow). In the population where gene flow from foreign individuals was low, no clear differences were observed between the fitness of local, foreign, and F1 hybrid individuals. In the population where gene flow was high, foreign individuals were successful due to high mating success rather than high survival, and F1 hybrids had the same fitness as pure local offspring. These results suggest the importance of considering sexual selection, rather than just local adaptation and genetic rescue, when evaluating the determinants of success in small and recently founded populations. |
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Programme |
1041 |
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Approved |
yes |
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Call Number |
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Serial |
8179 |
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Title |
Exploring the Microdiversity Within Marine Bacterial Taxa: Toward an Integrated Biogeography in the Southern Ocean |
Type |
Journal |
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Year |
2021 |
Publication |
Frontiers in Microbiology |
Abbreviated Journal |
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Volume |
12 |
Issue |
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Pages |
1985 |
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Keywords |
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Abstract |
Most of the microbial biogeographic patterns in the oceans have been depicted at the whole community level, leaving out finer taxonomic resolution (i.e., microdiversity) that is crucial to conduct intra-population phylogeographic study, as commonly done for macroorganisms. Here, we present a new approach to unravel the bacterial phylogeographic patterns combining community-wide survey by 16S rRNA gene metabarcoding and intra-species resolution through the oligotyping method, allowing robust estimations of genetic and phylogeographic indices, and migration parameters. As a proof-of-concept, we focused on the bacterial genus Spirochaeta across three distant biogeographic provinces of the Southern Ocean; maritime Antarctica, sub-Antarctic Islands, and Patagonia. Each targeted Spirochaeta operational taxonomic units were characterized by a substantial intrapopulation microdiversity, and significant genetic differentiation and phylogeographic structure among the three provinces. Gene flow estimations among Spirochaeta populations support the role of the Antarctic Polar Front as a biogeographic barrier to bacterial dispersal between Antarctic and sub-Antarctic provinces. Conversely, the Antarctic Circumpolar Current appears as the main driver of gene flow, connecting sub-Antarctic Islands with Patagonia and maritime Antarctica. Additionally, historical processes (drift and dispersal limitation) govern up to 86% of the spatial turnover among Spirochaeta populations. Overall, our approach bridges the gap between microbial and macrobial ecology by revealing strong congruency with macroorganisms distribution patterns at the populational level, shaped by the same oceanographic structures and ecological processes. |
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Programme |
1044 |
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ISSN |
1664-302X |
ISBN |
1664-302X |
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yes |
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Call Number |
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Serial |
6457 |
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Journal |
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Year |
2021 |
Publication |
Frontiers in Marine Science |
Abbreviated Journal |
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Volume |
8 |
Issue |
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Pages |
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Abstract |
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Programme |
1201 |
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Series Issue |
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Edition |
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ISSN |
2296-7745 |
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Approved |
yes |
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Call Number |
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Serial |
8326 |
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Title |
Seabird Migration Strategies: Flight Budgets, Diel Activity Patterns, and Lunar Influence |
Type |
Journal |
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Year |
2021 |
Publication |
Frontiers in Marine Science |
Abbreviated Journal |
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Volume |
8 |
Issue |
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Pages |
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Abstract |
Every year, billions of birds undertake extensive migrations between breeding and non-breeding areas, facing challenges that require behavioural adjustments, particularly to flight timing and duration. Such adjustments in daily activity patterns and the influence of extrinsic factors (e.g., environmental conditions, moonlight) have received much more research attention in terrestrial than marine migrants. Taking advantage of the widespread deployment in recent decades of combined light-level geolocator-immersion loggers, we investigated diel organisation and influence of the moon on flight activities during the non-breeding season of 21 migrant seabird species from a wide taxonomic range (6 families, 3 orders). Migrant seabirds regularly stopped (to either feed or rest) during migration, unlike some terrestrial and wetland birds which fly non-stop. We found an overall increase for most seabird species in time in flight and, for several species, also in flight bout duration, during migration compared to when resident at the non-breeding grounds. Additionally, several nocturnal species spent more of the day in flight during migration than at non-breeding areas, and vice versa for diurnal species. Nocturnal time in flight tended to increase during full moon, both during migration and at the non-breeding grounds, depending on species. Our study provides an extensive overview of activity patterns of migrant seabirds, paving the way for further research on the underlying mechanisms and drivers. |
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Programme |
330,1036 |
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Bachelor's thesis |
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ISSN |
2296-7745 |
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Approved |
yes |
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Call Number |
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Serial |
8417 |
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Author |
Rob Harcourt, Mark A. Hindell, Clive R. McMahon, Kimberly T. Goetz, Jean-Benoit Charrassin, Karine Heerah, Rachel Holser, Ian D. Jonsen, Michelle R. Shero, Xavier Hoenner, Rose Foster, Baukje Lenting, Esther Tarszisz, Matthew Harry Pinkerton |
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Title |
Regional Variation in Winter Foraging Strategies by Weddell Seals in Eastern Antarctica and the Ross Sea |
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Journal |
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Year |
2021 |
Publication |
Frontiers in Marine Science |
Abbreviated Journal |
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Volume |
8 |
Issue |
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Pages |
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Programme |
1182 |
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2296-7745 |
ISBN |
2296-7745 |
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Approved |
yes |
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Call Number |
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Serial |
8609 |
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Title |
Effects of Climate and Atmospheric Nitrogen Deposition on Early to Mid-Term Stage Litter Decomposition Across Biomes |
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Journal |
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Year |
2021 |
Publication |
Frontiers in Forests and Global Change |
Abbreviated Journal |
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Volume |
4 |
Issue |
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Pages |
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Programme |
136 |
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ISSN |
2624-893X |
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Approved |
yes |
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Call Number |
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Serial |
8301 |
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Author |
Andreas Richter, Alexey A. Ekaykin, Matthias O. Willen, Vladimir Ya. Lipenkov, Andreas Groh, Sergey V. Popov, Mirko Scheinert, Martin Horwath, Reinhard Dietrich |
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Title |
Surface Mass Balance Models Vs. Stake Observations: A Comparison in the Lake Vostok Region, Central East Antarctica |
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Journal |
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Year |
2021 |
Publication |
Frontiers in Earth Science |
Abbreviated Journal |
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Volume |
9 |
Issue |
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Pages |
388 |
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Programme |
411 |
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ISSN |
2296-6463 |
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yes |
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Call Number |
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Serial |
8030 |
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| Permanent link to this record |
